A corpora



Nov. 9 ,1926. 6 1,606,536

A. ROSNER MECHANICAL INTERRUPTER Filed Feb. 20. 1924 I i will 30 INVENTOR .1. 29 440 505? filly-.6. ATTORNEY Patented Nov. 9, 1926.

il'l llTE STATES PATENT QFECE ADDLPH KOSHER, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR '10 AMERICAN BOSCH MAGNETO CORPORATION, OF SPRINGFIELD, MASSACHUSETTS, A CORPORA- TION OF NEW YORK.

MECHANICAL INTERRUIPTER.

Application filed February 20, 1924.

The present invention relates to mechanical interrupters of the rotary type actuated by a normally stationary cam or cams at the predetermined periods of ignition, and particularly to those adapted for rotary or oscillatory magnetos with wound armatures.

Heretofore it was customary in interrupters of this general kind to provide an interrupter disc, pressed-up or drop-forged 10 or machined to form, to hold the interrupter in place on the rotating member of the magneto and to carry the defiectable lever, and it was also customary to fasten to that disc but insulate therefrom a metal block, pressed or drop-forged or machined to form, to carry the normally stationary contact point cooperative with the contact point of the lever. This construction is comparatively expensive in material and asseinbly and is apt to lose its adjustment in service. a

In accordance with my invention the interrupter comprises two metal plates, fastened together but insulated from each other, as by insulated rivets and by an interposed plate of insulating material projecting; outwardly of the metal plates all around their periphery and intermediate their hubs to increase the electrical leakage path between them. If of sheet metal, one of the plates may have a bent-up contact point post, preferably with an extruded socket screw threaded, to carry the normally fixed contact point, and the other plate may have a bent-up post preferably having a fulcrum on which the lever carrythe cooperative point deflects when its striking block is engaged by the cam. So so the latter plate may have a bent-up spring-supporting post to which one end of a flat spring is fastened, and a projecting flat table acting to steady or guide the in tcrrupter lever in one direction in its deflecting movements. The other end of the spring is fastened to the lever near its strikhlock to continually urge the deflectable contact point at the other end of the lever into engagement with the fixed contact point and at the same time to continually hold the lever on its fulcrum, which then guides the lever in its deflecting movements to thereby maintain the alinement of the contact points and practically eliminate all scrubbing action of the deflectable contact Serial No. 694,133.

point on the other. By having the flat spring substantially straight, rather than materially curved, not only is the spring shorter, but it is stiffer against endwise pressure of the striking block, which further prevents the movement of the lever off its fulcrum and also the sidewise twisting movements that contribute to the scrubbing action.

If desired, the posts, or any of them, may be separate pieces fastened to the plates in any suitable way, the essential point being that they are carried by the plates. But by making the plates of sheet metal, the post carrying the fixed contact point, or the spring supporting post if provided, or the fulcrum post, may readily be bent in production to line up the contact points with one another, to give the proper tension and position to the spring and to give the proper movement in deflection, whereas in other interrupters of this general kind these adjustments are more difiicult and expensive and often impossible, both in production and in service after the contact points and other parts are worn If desired, the plate carrying the fulcrum may also have a guard embracing the lever and co-acting with the projecting table to further prevent sidewise and twisting movements of the lever in its deflecting movement, which guard is bent up to shape if the plate carrying it is of sheet metal. Also one of the rivets holding the plates together may in itself form a socket for the grounding brush usual in rotary magnetos. Likewise the other rivet may also carry a post to which the end of the spring may be fastened but, whether it does or does not, the insulating washer under its head may form a stop to limit the outward def action of the lever, which is desirable at high speed to decrease the angular period during which the contacts are separated and to reduce chattering of the lever when the contacts engage and to reduce the strength of the lever necessary for the decreased impact upon closure of the points. i

In any of these constructions the lever may be of any suitable form or material, but for cheapness, lightness and stren th it is preferably made of sheet metal ha an extruded table which the c point is welded or brazed, thus eliminating lit) the usual scr or rivet carryi g I the contact point. hether or not the lever is of sheet metal, the othe end is suitably roughened on the surface a; ace .t the striking block to prevent the block from tr ning around the rivet holdin" t and the spring to the lever, and a Dal band encircles the striking blocl: and the spring with the lever tl'ierebetwcen so that the rivet passing through them all holds them in the position in. which they are first fastened.

In applying such an interrupter to a retary or oscillatory magneto, particularly of the present types, it is advantageous to provide a tapered. lit between tie interrupter and the inside bore oi the hell rear end shaft of the magneto, so as to line up and secure the interrupter with the shaft, and also to provide a ta' iered bore the in terrupter screw to hold the interrupter in place on the rear end shaft and to electrically connect the interrupter with. the primary winding and condenser. l i l'ien the interrupter plates are of sheet n'ietal, one has an extruded hub of the proper taper with a key pressed out to lit a key-way in the rear end shatti'or preventing the interrupter from. turning therein.

i'lhether not this plate is of sheet metal, the hey is slit along both sides but joined at both ends to prevent it from breaking oil c. pressing down when subject to the great shock upon impact of the tripping pin finger with the trip lever of an oscillatory magneto. The other plate, when of sheet metal, has an extruded hub projecti g within the other hub in registry therewi l. and being of proper taper to receive the tapered shanl: of the interrupter screw. ln this construction the plate having the hub fitting the rear end shaft is electrically connected to the rear end shaft therei'orc grounded on the magneto 'irame That plate is the one that carries the interrupter ground brush, where provided, and co": sponds electrically to the interruoter of prior interrupters. But whereas merly the interrupter disc carried the interrupter lever, which is then grounded, and the insulated block carried the stationary contact point, which is then insulated, the reverse is true in my interrupter, there by providing better for the acconnnodation of the posts within the restricted space now available in the interrupter housing of magnetos.

In the accompanying drawings ing my invention in application, ample, to an interrupter having shee plates with bent-up posts and er. hubs, and applied to a. rotary or oscillatory magneto of the wound armature type.

Fig. 1 represents a front elevation of the interrupter: 2 is a section on line. 22 of Fig. 1 showing also the rear end of the magneto; Big. 3 represents partly in front elevation and partly in section the grounded plate of the interrupter; Fi l represents a front elevation'of the intermediate insulating plate; Fig. 5 represents partly in front elevation, partly in section and partly broken away the insulated plate of the interrupter; Fig. 6 represents a side elevation of a portion of the grounded plate; Fig. 7 is a section on line 7*? of 6; Fig. b shows the parts or the interrupter lever in position for assembly; and Big. 0 repre sents on a reduced scale a modified form of interrupter arranged for the reverse direction of rotation- The magneto has a magnet .1 and an aluminum frame 2 with a base plate 3 and a rotary or oscillatory wound armature at with a condenser housing 5. The condenser o has one terminal connected to one end of the primary winding and grounded on the condenser housing by the screw 7, and has its other terminal connected to the other end of the primary winding and also to the insulated screw-threaded socket f). The condenser housing is engaged by a frame ground brush 9 and carries a rear end shaft 10 with its inner bore tapered at ll. The also 12 provides the rear end bearing 13 for the armature and is listed in the frame by screws (not shown) and by the dowel pin 1%. In the case of an oscillatory or a fined-ignition rotary magneto, as herein shown and described, the cam or cams 1:" are carried by the disc 12, but where timing range is provided, the cams may be carried in the same position by a cam ring which can be turned in the interrupter housing 16 for timing.

Referring particularly to Figs. 1 to S, the interrupter has two sheet-metal plates 17 and 18 oi generally elliptical contour of about equal size. These metal plates insulated from each other by the plate of insulating material 19 which projects beyond the metal plates all around their periphery as indicated at 20. The metal plates with the insulating plate interpocd are rigidly fastened together by the two me rivets 21 and 22 which are located near the periphery of the metal plates diametrically opposite each other and which insulated from the metal plate. 18 by the insulating washers 23 and The rivet 22 has combined with it a brush socket carrying the spring-pressed interrupter ground brush 25 which contacts with the disc 12.

The grounded plate 17 has an extruded hub 26 tapered outside, as well as inside, to tit the tapered bore 11 oi? the rear end shaft. A key 27, slitted along both sides but joined at both ends to the hub, is pressed out of the hub so as to fit the key way at 28 in the rear end shalt. Also the plate has the bent-uppost 29 with the extruded socket screw threaded to take the normally fixed contact point screw 31, which carries the contact point 32 of tungsten or platinum and is provided with a lock nut 33 in engagement with the surface of the post opposite the socket.

The plate 18 has a bent-up spring-supporting post 34:, a bent-up post 35 having a rounded edge at 36 forming a fulcrum, a fiat table 37 projecting outwardly, and a bent-up guard 38. The hub 39 is extruded and projects within the other hub 26 in registry therewith. The hole at 40 in the insulating plate registers with the hubs 26 and 39 and is of a diameterintermediate the inside bores of the hubs.

The interrupter lever 41 is made of sheet steel bent up and having near one end an extruded table 42 to which is brazed the contact point 43 of tungsten or platinum cooperative with the contact point 32, and near the other end a series of serrations 44. along one surface. The striking block 45 abuts the serrated surface and has a step 16 abutting the end of the lever at 17 The fiat spring 48, substantially straight as shown, is fastened near one end to the spring-supporting post 34 by the screw 4:9 and the lock washer 50, and its other end abuts the surface of the lever opposite the striking block 45. The metal band 51 embraces the striking block, the lever and the spring, and the rivet 52 passes through all of them to rigidly hold them in their assembled position, the step 16 on the striking block, and theserrations in the lever when forced into the striking block, preventing all of the parts from turning about the rivet 52. The spring 48 holds the lever on the fulcrum 36 in the movements of de flection of the lever 41 from and to its closed position as shown in Fig. 1. The table 3'7 is substantially in engagement with one face of the band 51, and the guard 38 is likewise substantially in engagement with the lever -11. It will be observed from Figs. 1 and 2 that the insulating washer -23 limit-s the outward movement of the lever 41.

The interrupter screw 53 has atapered shank at 5 1 which fits the tapered bore of the extruded hub 39, so that when the interrupter screw is drawn into the socket 8, the hub 26 is drawn tightly into the rear end shaft 10 with the key 27 in the key-way 28 to prevent the interrupter from turning therein. At the same time the interrupter is held concentrically to the rear end shaft with the plate 17 grounded thereon, whereas the tapered shank 54 forms an insulated electrical connection between the condenser socket 8 and the plate 18.

In the modification shown in Fig. 9, the spring 55 is materially curved as shown, and fastened to a spring post 56 combined with a rivet. As is sometimes the case with interrupters of any kind for oscillatory magnetos, the rivet 57 is not combined with a grounding brush. Also the contact point.

The metal plates and lever are cyanide hardened and are then zinc plated, to resist wear and for protection against rusting.

Having thus described my invention, what I claim is:

1. In a rotary interrupter, two metal plates fastened together and insulated from each other, a normally fixed contact point caried by one plate, a spring-supporting post carried by the other plate, a post carried by that other a lever in contact with and deflectable about said fulcrum and carrying near one end a contact point cooperative with the fixed contact point and near the other end a striking block, and a flat spring fastened near one end to said spring-supporting post and near the other end to the lever near the striking block. I

2. In a rotary interrupter, a metal plate, a normally fixed contact point carriedby said plate, a sheet-metal. plate fastened to the metal plate and insulated therefrom, said sheet-metal plate having a bent-up springsupporting post and also a bent-up post having a fulcrum, a lever deflectable about said fulcrum and having a contact point cooperative with the fixed contact point and also having a striking block, and a spring fastened to the spring-supporting post and to the lever.

3. In a rotary interrupter, two sl1eet-1netal plates fastened together and insulated from each other, one plate having a bent-up contact post and the other having a bent-up spring-supporting post and also a bent-up post having a fulcrum, a normally fixed contact point supported by the contact post, a lever deflectable about said fulcrum and having a contact point cooperative with the fixed contact point and also having a strikingblock, and a spring fastened to the spring-supporting post and to the lever.

1. In a rotary interrupter, two metal plates fastened together and insulated from each other, a normally fixed contact point carried by one plate, and a deflectable lever carried by the other plate and having a contact point cooperative with the fixed contact point, the plate which carries the lever having a flat table projecting outwardly plate and having a fulcrum,

substantially in engagement with the lever to prevent sidewise movement in one direction during deflection thereof.

5. In a rotary interrupter, two metal plates fastened together and insulated from each other, a normally fixed cont ct point carried by one plate, a post car ed by the other plate and having a fulcrum, and a lever car ied by the other plate for deflection about said fulcrum and having a con tact point cooperafve with the fixed contact point, the plate which carries the lever having a fiat table projecting outwardly of the plate substantial y in engagem nt with the lever to prevent sidewisc move out in one direction during deflection thereof.

6. In a rotary interrupter, two metal plates fastened together and insulated frc i each other, a norm lly fixed contact point carried by one plate, a spring-s...pportng post carried by the other plate, a postcarried by that other plate and having a fulcrum, a lever carried by t otl er plate for deflection about said fulcrum \ic. havi g near one end a contact point coopcratixe With the fixed contact point and near the other end a striking block, the p rte which carries the lever having a flat e projecting outwardly of the plate substantially in engagement with the lever .10 preve sidewise movement in one direction du deflection thereof, and a flat spring fastened near one cue to said spring-supporting post and near the other end to the lever near the striking block.

7. In a rotary interrupter, two metal plates fastened together and lllSUlStiQt from each other, a normally fixed contact point carried by one plate, a deflectable lever carried by the other plate and havi a contact point cooperative with the fixed contact point, and a guard which is carried by the plate carrying the lever and which embraces the lever substantially in engagement therewith to prevent the sidewise movement in both directions during deflection thereof.

8. In a rotary interrupter, two metal plates fastened together and insulated from each other, a normally fixed contact point carried by one plate, post carried by the ther ,late and hav' a fulcrum, a lever carried by that other plate for deflection about said fulcrum and having a contact point cooperative with the fixed contac point, and a guard which is carried by the plate carrying the post but at the opposite side thereof said guard embracing the lever substantially in engagement therewith to prevent the sidewise movement both d2- 1,606.,tsq

with a fulcrum, a lever carried by the sheetmetal plate for deflection about said fulcrum and carrying a contact point cooperative with the fixed contact point and also carry-ing a striking block, the sheet-metal plate also having a flat table projecting outwardly substantially in engagement with the lever to prevent sidewise movement in one direction during deflection thereof.

10. In a rotary interrupter, a metal plate, a normally fixed contact point carried by said plate, a sheet-metal plate fastened to the other plate and insulated therefrom, and a deflectahle lever carried by the sheetmetal plate and having a contact point cooperative with the fixed contact point, said sheet-metal plate having a bent-up guard embracing the lever substantially in engagement therewith to prevent sidewise movement in both directions during deflection thereof. 7

11. In rotaryinterrupter, two metal plates fastened together and insulated from each other, a normally fixed contact point carried by one plate, a sheet-metal deflectable lever carried by the other plate and having an ex *uded table near one end, and a contact point fastened on said table in cooperation with the fixed contact point.

12. In a rotary interrupter, a normally titted contact point, a deflectable lever having a contact point near one end cooperative with the fixed contact point, a flat spring having one end abutting one surface of the lever near its other end, a striking block abutting the surface of the lever opposite the spring and having a step abutting the end of the lever, and a rivet passing through the spring the lever and the striking block to fasten them rigidly together.

13. In a rotary interrupter, a normally fixed contact point, a deflectable lever having a contact point near one end cooperative with the fixed contact point, a flat spring having one end abutting one surface of the lever near its other end. a s riking block abutting the surface of the lever opposite the spring, a band embracing the spring the lever and the striking block, and a rivet passing through the band the spring the lever and the striking block to fasten them rigidly together.

'14. In a rotary interrupter, a normally fixed contact point, a deflectablelever carrying a contact point cooperative with the fixed contact point, a striking block having a step abutting the end of the lever, a flat spring, a retaining band, and a rivet passing throughthe band the spring the lever and the striking block to fasten them rigidly together.

15. In a rotary interrupter, two metal plates fastened together and insulated from each other, a normally, fixed contact point carried by one plate, a deflectable sheetpassin throu h the band the s rin the e g P a lever and the striking block to fasten them rigidly together.

16. In a rotary interrupter, two metal plates fastened together and insulated from each other, normally fixed contactpoint carried by one plate, a deflectable lever carried by the other plate, and having a contact point cooperative with the fixed contact point, and a brush socket fastened to the plate carrying the fixed contact point and insulated from the other plate.

17. In a rotary interrupter, two metal plates, a plate of insulating material interposed therebetween, a normally fixed contact point carried by one of the plates,a deflectable lever carried by the other plate and having a contact point cooperative with the fixed contact point, and a combined rivet and brush socket fastening the three plates together and being insulated from one of the metal plates.

18. In a rotary interrupter, two metal plates, a plate of insulating material interposed therebetween, a normally fixed contact point carried by one of the plates, a deflectable lever carried by the other plate and having a contact point cooperative with the fixed contact point, and a combined rivet and brush socket fastening-the three plates together and being insulated from the plate which carries the deflectable lever.

19. In a rotary interrupter, two metal plates, a plate of insulating material interposed therebetween, a normally fixed contact point carried by one of the plates, a deflectable lever carried by the other plate and having a. contact point cooperative with the fixed contact point, a combined rivet and brush socket passing through the plates near the periphery thereof, and a second rivet passing through the plates near the periphery thereof but diametrically opposite the other rivet, said rivets rigidly fastening the three plates together and being insulated from the plate Which carries the defiectable lever.

In testimony whereof I affix my signature.

ADOLPH ROSNER. 

